I don’t find refund

Complaint Details : Name of the company- Amazon Product type- Handset Moto E4 Plus Order ID-171-3608663-8482723 Date of Order-18/9/2018 Date of Payment-18/9/2018 Date of Delivery-Update Later Date of Return-1/10/2018 Tracking Id-EF235618015IN Mode of Payment-By Debit Card Amount Paid-Rs7299/- Registered Mail [email protected] Registered Contact No-8877259497 Present status-Paid amount not return . Greivance Details-Consumer ordered a Handset Moto E4 Plus from Amazon on 18/9/2018 and paid Rs7299/- through Debit Card .After delivery he noticed that the handset is defective .Then he contact with the company ,they suggest him return the handset .They also assured him they will refund the amount within 1 week after return the handset .He returned the handset on 1/10/2018 .But till now company did not refund the amount .So he wants to sent his grievance against the company .He wants the refund as soon as possible .